Ignition-dynamo.



C. T. MASON.

IGNITION DYNAMO.

APPLICATION FILED JAN. 7. 1916.

1,209,003. Patented M119, 1916.

Car/ 7770070: (Va 6 on UNITED STATES PATENT OFFICE.

CARL THOMAS MASON, OF EAST ORANGE, NEW JERSEY, ASSIGNOR TO SPLITDORF ELECTRICAL COMPANY, OF NEWARK, NEW JERSEY, A CORPORATION OF NEW JERSEY.

IGNITION-DYNAMIC. I

Patented Dec. 19, 1916.

Application filed. January 7, 1916. Serial No. 70,802.

J T all whom it may con ern Beit known that I, CARL THOMAS MAsoN, a citizen ofthe United States, residing at East Orange, in the county of Essex and State of New Jersey, have invented new and useful Improvements in llgnit'ion-Dyna mos, of which the following is a specification, reference being had to'the accompanying drawings.

This invention relates to ignition dynamos of the type commonly known as magnetos.

The objects of the invention are to produce a machineof compact and simple construction in which there is no revolving wire; to eliminate the U-shaped magnets commonly used with magnetos and instead to arrange the magnetic element of the machine in a most compact and efficient form, and to-provide a machine in which the spark will be of the same intensity either full advance or retard.

Another object is to provide a breaker or interrupter operated directly from the rotor in such a manner that. all inaccuracies of timing due to wear of the moving parts will be eliminated to a larger degree than heretofore.

Further objects will more fully hereinafter appear.

In the accompanying drawings, Figure 1,

This end plate together with the side cover plates 3 and 4 and the top cover 5 form a complete housing for all of the working parts.

Mounted within the housing, as shown in Fig. 1, is a cylindrical field structure 6. One

end of this structure, as shown at 7, proj ects outside of the housing and has attached to it a-suitable lever 8, by which the entire field structure andthe parts carried thereby may be angularly adjusted in relation, to the moving element hereinafter described.

In suitable ball-bearings such as 9 and 10 in the field structure 6, is mounted a rotor comprising two bar magnets 11 and 12, se cured together at one end by the magnetic block 13 which may be integral with the driving shaft 14. The remaining ends of the bar magnets are secured together by the non-magnetic block 15 which may be of brass or bronze, and which may be integral with the supporting shaft 16. Secured in opposite sides of the field structure 6 in any suitable manner are the laminated field pieces 17 and 18, the lower extremities of which form pole shoes adjacent the path of travel of the poles N. S. of the rotor. The upper extremities of 17 and 18 are joined together by the core 19 of the coil 20, said coil having a suitable winding or windings as ordinarily used on magnetos.

In connection with a high tension magneto, one end of the primary and secondary winding is connected to the core 19, while the remaining end of the primary winding is by means of terminal 20 and conductor 21 connected to the insulated contact 22 of the interrupter. From 22 the primary circuit is completed back to core 19 by the movable contact member 23 of the interrupter, as 23 is carried directly on and in electrical connection with the framework of the machine. A condenser 24 is connected across the primary winding by having one of its terminals connected to the terminal 20 on the coil and its remaining terminal 33 connected to the core 19 at 34, or any other suitable portion of the framework of the machine. The free end of the secondary or high tension winding is connected to the metal segment 25 supported on the rubber block 26, which is movable with the coil and field structure 6 for timing purposes as hereafter described.

By moving the lever 8 the field structure 6, together with the field pieces 17 and 18, the coil 20, and the segment 25 are movable, and may be angularly adjusted in relation to the position of the revolving magnet driven by shaft 14. Stops 27 and 28 maybe made part of the movable field structure to limit the movement thereof in relation to the outer casing l.

The high tension current is brought out of the magneto by means of the brush 29 carried in the insulating support 30, to the upper end of which a suitable conductor sion distributer may be mounted on the magneto, and supplied from brush 29.

It is well known that the most effective point at which to interrupt the primary circuit of a magneto to procure the best spark is when the end 31 of the rotor is just leaving the edge 32 of the adjacent pole piece, supposing the rotation to be right hand, Fig. 2. Heretofore to accomplish this result the interrupter or breaker mechanism has usually been arranged on the end of the machine adjacent a cam mounted on the projecting end of shaft 16, and said cam has been ground or otherwise accurately formed to strike the member 33 in the movable member of the interrupter thereby separating the platinum points with which the members 22 and 23 are usually equipped at the proper instant. It is evident that should the cam wear, or should the keyway on the shaft be inaccurately located thereby misplacing the cam, or should in the assembly of the cam on the shaft any inaccuracy in workmanship occur,

that the opening of the platinum points would not occur at the correct point in relation tothe position of the edge 31 of the rotor and the adjacent edge 32 of the pole piece. In other words the break of the interrupter would not occur with the rotating element of the magento at the place to insure maximum efliciency.

In my improved interrupter the movable member 23 is pivoted on a suitable projection on the field structure 6, which also can ries the fixed member 22, insulated therefrom. The bumper 33 projects through an opening in 6-sufliciently to be operated by the magnets 11 and 12 of the rotor. I breaking the circuit by operating the in- This terrupter directly fromthe rotor eliminates the necessity for the use of a cam, and all of the attendant troubles incident thereto, besides resulting in a more compact and efficient interrupter, located away from the bearings where it cannot be reached by oil, and arranged in a most accessible manner, a small cap 35 being provided on the upper part of the casing 1 and the interrupter be ing located immediately thereunder. It will be understood that the entire interrupter is movable with the structure 6. As in this type of magneto the magnets 11 and 12 are of hard steel and accurately ground, wear between them and bumper 33 is reduced to a minimum. Furthermore the rotor being of comparatively large diameter as compared with the small cams ordinarily used, a quick break is obtained at slow speeds as the action on the movable member 23 of the interruper is more sudden owing to the greater angular speed of the rotor than when a small cam is used.

The operation of a magneto of this construction will be readily understood by considering N S to be the respective poles of a permanent magnet. These poles conduct the magentic flux to the pole shoes of 17 and 18 alternately and oppositely thereby causing a flux through the core of the coil, and generating a current in the well known man- It will be observed that as the magnets themselves rotate, the only air gap in this magneto is between the polar surfaces of the magnets 11 and 12 and the adjacent pole shoes of 17 and 18, and that there is no necessity for any close fits anywhere else in the machine so far as magnetic efliciency is concerned except between the core 19 and the upper ends of the pole pieces 17 and 18.

I claim.

1. A magneto electric generator including a rotor comprising a permanent magnet,

a set of pole pleces angularly adjustable about the axis of said rotor, and a winding in fixed relation to the said adjustable pole pieces and adapted to be acted upon by the magnetic flux passing through said pole pieces.

2. A magneto electric generator including a rotor comprising a permanent magnet, a set of pole pieces angularly adjustable about the axis of said rotor, a winding in fixed relation to said adjustable pole pieces and adapted to be acted upon by the magnetic flux passing through said pole pieces,

and an interrupter controlled for adjustment with the adjustable pole pieces whereby the time of interruption is varied when the position of the pole pieces is varied.

3. A,magneto electric generator including a rotary magnet, a field structure comprising a cylindrical housing inclosing said magnet and mounted concentrically therewith, pole pieces carried by said field structure and therewith angularly adjustable about said magnet, a winding in fixed relation to said ating coil and core therefor in inductive relation to said magnet.

6. In an ignition dynamo, a permanent magnet journaled to revolve on an axis parallel to its largest dimension, and a normally stationary current generating coil and core therefor in normally fixed inductive relation to the poles of said magnet.

ary current generating coil in inductive re lation to said magnet.

8. In an ignition dynamo, a rotor comprising a permanent magnet having N. and S. poles, curved radial faces on said poles, an adjustable field structure, a winding on said field structure, curved polar faces on said field adjacent the radial faces of said magnet poles, and a condensercarried by said field structure.

9. In an ignition dynamo, a substantially U-shaped magnet comprising a rotor, a support for said rotor forming a field structure, windings on said field structure, pole shoes on said field structure adjacent the path of travel of said magnet, and a condenser carried by said field structure.

10. An ignition dynamo comprising a field structure, a rotor comprising a permanent magnet, the poles of which are inclosed by said field structure, a casing inclosing and surrounding said field structure and rotor, and means external said casing for adjusting the field structure in relation to the rotor.

11. In a dynamo,generating windings, a rotor comprising a premanent magnet, a

core structure for the windings; a base carrying all of the foregoing parts, and a casing clamped to said base and covering said generator windings, core structure and rotor.

12. A rotor for magnetos comprising permanent bar magnets, a head of magnetic material secured to one end of said magnets, a head of non-magnetic material having a shaft integral therewith secured to the polar ends of said magnets, said shafts adapted to rotatably support said magnets.

13. A rotor for magnetos comprising a U-shaped permanent magnet, a shaft whereby said magnet is rotatably supported, said shaft being parallel to the straight sides of said magnet, a field structure inclosing and rotatably supporting said magnet, a generating coil having a core and pole pieces carried by said field, and a base in which said field structure and rotor is movably supported, substantially as described.

14:. In an ignition dynamo, a normally stationary generating coil and core therefor, pole shoes connected to said core and shiftable bodily therewith, and a rotor comprismg a U-shaped permanent magnet, said magnet having its polar path of travel lying entirely within the space between said pole shoes whereby fiux may pass from said magnet poles directly to said pole shoes alternately andoppositely as said magnet is revolved.

15. In an ignition dynamo, a primary field structure including a rotatable permanent magnet, a secondary field structure having adjustable poles shiftable about the path of movement of said primary field structure, and a lever connected to the secondary field structure and adapted when moved to turn the same so as to effect an angular dlsplacement of the secondary field poles to advance or retard the spark.

16. In an ignition dynamo, a primary field structure comprising a rotatable permanent magnet, a secondary field structure havlng adjustable poles, and a lever connected to said secondary field structure and adapted when moved to turn the same so as to effect an angular displacement of the secondary field poles to advance or retard the spark, together with an interrupter mechanism mechanically connected to and moved with said secondary field poles whereby the single adjusting lever moves all of the related parts as one unit. I

In an ignition dynamo, a casing compr slng a base, side plates, and a cover about said side plates, a generating coil and related parts in the space within said cover, a

field structure secured between said side plates and movable therein, and a rotatable magnet within said field structure, substantially as described.

In an ignition dynamo, a casing comprlsing a base, end plates, a field structure movably supported in said end plates said field structure including pole pieces em bedded therein and carrying at their upper extremities a winding, a rotatable magnet positioned in the bore of said field structure, a shaft projecting from said magnet and extending outside said casing whereby said magnet may be rotated and means on said field structure extending outside said casing whereby the angular position of said field structure may be varied in relation to said magnet.

19. In an ignition dynamo, a rotatable magnet, a shaft therefor, a coil supported above said magnet, a circuit terminal on said coil, an end-plate, a circuit terminal on said end-plate cooperating with the circuit terminal on said coil, and means whereby said. coil may be angularly adjusted in relation to said rotatable magnet, substantially as described.

20. In an ignition dynamo, a rotor comprising elements of permanent and opposite polarity, a field structure surrounding and inclosing the polar extremities of said elements, pole shoes on said field structure, a

coil having a core magnetically connected to said pole shoes, a casing surrounding and inclosing all of the before-mentioned parts, a shaft passing through said casing and adapted to rotate the magnetic elements within, and means connected to said field I at structure and external said casing whereby said field structure, together with its coil, may be angularly adjusted, substantially as described.

21. In an ignition dynamo, a rotor comprising permanent magnets having curved radial faces, a normally fixed field structure, and an interrupter carried on said field structure and adapted to be mechanically operated by said magnets.

22. In an ignition dynamo, a rotor com-' prisin'g per nanent magnets having curved radial facesf a field structure adjustable about said magnets, and interrupter mechanism carried by said field structure and adapted to be mechanically operated by said rotor.

23. In an ignition dynamo, a rotor comprising permanent magnets, a field structure surrounding and inclosing said rotor, interrupter mechanism, adjacent said rotor, a generating winding, pole shoes therefor, said pole shoes being movable with said field structure, and a connection between said winding and said interrupter.

24. In an ignition dynamo, a rotor comprising a permanent magnet, a field structure inclosing a portion of said magnet, an interrupter comprising a fixed mounted on said field structure and insulated therefrom, a movable interrupter contact cooperating With said fixed contact, and means for operating said movable interrupter contact directly-from the surface of said rotor, substantially as described.

25. In anignition dynamo, a rotor having curved radial faces, a casing about said contact rotor adjustable for timing purposes and an interrupter mounted on said casing and movable therewith and adapted to be operated directly from the curved radial faces of said rotor, substantially as described.

26. In an ignition dynamo, an outer casing, a terminal mounted thereon, a coilcarrying structure movably positioned in said outer casing, a coil on said structure, connections between said coil and said ter minal, and a rotor within the coil-carrying structure, said rotor camprising permanent bar magnets, substantially as described.

27. In an ignition dynamo, a rotor, a casing therefor, and interrupter mechanism positioned on said casing and projecting therethrough and adapted to be operated directly from said rotor, substantially as described.

ed to engage .a portion of the said circum-' ferential surface of said rotor, substantially as described.

CARL rHoMAs MASON.

Witnesses I II. R. VAN DEVENTER, C. W. CuRTIss. 

